[1] HUSLAB, Helsinki, Finland
[2] Univ Helsinki, Dept Clin Pharmacol, SF-00250 Helsinki, Finland
[3] Univ Helsinki, Cent Hosp, Helsinki, Finland
[4] Univ Turku, Dept Child Psychiat, Turku, Finland
[5] Natl Inst Hlth & Welf, Helsinki, Finland
[6] Columbia Univ Coll Phys & Surg, New York State Psychiat Inst, Dept Psychiat, New York, NY 10032 USA
[7] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA
[8] Nord Sch Publ Hlth, Gothenburg, Sweden
[9] Univ Helsinki, Dept Child Psychiat, Helsinki, Finland
[10] Columbia Univ Coll Phys & Surg, Mailman Sch Publ Hlth, Dept Biostat, New York, NY 10032 USA